| 摘要 |
A fractional-N frequency synthesizer includes a first divider, a second divider, and a division ratio controller. The first divider receives and divides an oscillation frequency signal. The second divider receives a predetermined feedback frequency signal and divides the feedback frequency signal in response to a selection signal. The division ratio controller receives and divides an output signal of the first divider and an output signal of the second divider and generates a reference frequency signal in which the oscillation frequency signal is divided, a comparison frequency signal that is compared with the reference frequency signal, and the selection signal used to select the division ratio of the second divider. |
